http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60520
Bug ID: 60520
Summary: stack adjustment are not merged anymore
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ubizjak at gmail dot com
Following testcase:
--cut here--
extern void foo (int *);
extern int *bar;
void test (void)
{
if (*bar)
foo (bar);
}
--cut here--
compiles with gcc-4.9 to (-O2 -m32):
test:
movl bar, %eax
movl (%eax), %edx
testl %edx, %edx
jne .L7
ret
.p2align 4,,10
.p2align 3
.L7:
subl $24, %esp
pushl %eax
call foo
addl $16, %esp <<<
addl $12, %esp <<<
ret
A single "addl $28, %esp" should be emitted here, as is the case with gcc-4.8:
test:
movl bar, %eax
movl (%eax), %edx
testl %edx, %edx
jne .L7
ret
.p2align 4,,7
.p2align 3
.L7:
subl $28, %esp
movl %eax, (%esp)
call foo
addl $28, %esp <<<
ret
